Flow and Transport in Tight and Shale Formations: A Review

Figure 2

Oil reservoirs are divided into plays, each of which bears particular characteristics. The region in which oil/gas reserves are easily accessible with conventional technology is called conventional play, whereas those inaccessible regions surrounding conventional play are called unconventional play. They require unconventional technologies to access the oil/gas reserves. At the early stage of production of oil and/or gas from a reservoir, easily accessible oil and gas flow relatively easy to the production wells. When such oil and/or gas are depleted, oil and gas in the halo region are considered. Modified from the Canadian Society for Unconventional Resources.